The New York Times Company said it added digital subscribers and slowed its declines in print and digital advertising revenue during the fourth quarter of 2013, a year of transition for the newspaper publisher.

For all of 2013, revenue from digital-only subscriptions, a primary growth engine for the company, increased to about $149 million, or 36 percent over the prior year, excluding the effect of an additional week, for accounting purposes, in 2012.